How to receive and decode WSPR with a simple RTL-SDR

WSPR (pronounced „whisper“, Weak Signal Propagation Reporter) is a digital radio protocol for probing potential propagation paths with low-power transmissions. The WSPR protocol can decode signals with a SNR (Signal-to-noise ratio) as low as -28 dB. A typical transmission contains…

My SOTA Journey – From Novice to Veteran

A famous Chinese proverb says, “Every journey begins with a single step.” From getting my first ham radio license, to earning the coveted Summits on the Air (SOTA) “Mountain Goat” award with more than 1,000 SOTA activation points (not there…

How to decode SSTV images with MMSSTV

Several times a year the ARISS (Amateur Radio on the International Space Station) team is setting up SSTV (Slow Scan Television) events where images are transmitted from the ISS down to earth. The SSTV signal can be received with a conventional hand held radio…

European SOTA Activity Day 2020

The European SOTA Activity Day 2020 took place on Saturday, 19th September 2020. It developed out of the OE5 SOTA Day which usually takes place in the middle of September. OE5 SOTA Day was initially created to bring together SOTA…